From patchwork Tue Sep 1 12:36:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sanchayan X-Patchwork-Id: 7105231 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2AA239F1D5 for ; Tue, 1 Sep 2015 12:43:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CB0F1205E6 for ; Tue, 1 Sep 2015 12:43:14 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 79971205E2 for ; Tue, 1 Sep 2015 12:43:13 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZWks9-0002G1-Ji; Tue, 01 Sep 2015 12:41:09 +0000 Received: from mail-pa0-x22f.google.com ([2607:f8b0:400e:c03::22f]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZWks5-00020V-8C for linux-arm-kernel@lists.infradead.org; Tue, 01 Sep 2015 12:41:06 +0000 Received: by pacdd16 with SMTP id dd16so175981652pac.2 for ; Tue, 01 Sep 2015 05:40:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=hwu6YHj8pJeRElj1W/txXMvEW7yN4Mnh7i5ERftgNH8=; b=dfmD2X6XJYbgzI4LXUBNG/UW4/xjt9USROKPUYQKUrnKvq9Fq407AEKFyjW+2N5rmB Dnd6bqwoR6OwkbKIA9BpDsejlExAtP7YZ097shia+gQh2sd3H4okXN+m3HIN2a7hc9mp u0Q0wr9eiIwQjUJctwMzC6pzHtxd/aARQqxxnIZOqBDhe1OhUdIIB7NdJSPpuwkoxtfN 9kUNsW8d0mP+z47uOBtpEK0lHrv1U9v5IrBX09H8xz3xIfeQq3otylzHSKsBp90f+G4j T2fq3F1OsNLBI3yny9qSKb0M5Jdbq+QJVh+sFMHcBigmcx86/dZ5jhvih9rJCZTjoqLr I/VQ== X-Received: by 10.67.5.228 with SMTP id cp4mr35011556pad.120.1441111244313; Tue, 01 Sep 2015 05:40:44 -0700 (PDT) Received: from localhost ([115.115.225.206]) by smtp.gmail.com with ESMTPSA id j7sm18100708pdn.8.2015.09.01.05.40.43 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Sep 2015 05:40:43 -0700 (PDT) From: Sanchayan Maity To: dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v5 3/3] touchscreen: colibri-vf50-ts: Add touchscreen support for Colibri VF50 Date: Tue, 1 Sep 2015 18:06:55 +0530 Message-Id: <17e0c0bb9b89fe079ae9c252a56287a72be62b23.1441110400.git.maitysanchayan@gmail.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: References: In-Reply-To: References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150901_054105_425169_6D2833C8 X-CRM114-Status: GOOD ( 28.41 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Sanchayan Maity , shawnguo@kernel.org, linux-kernel@vger.kernel.org, stefan@agner.ch MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The Colibri Vybrid VF50 module supports 4-wire touchscreens using FETs and ADC inputs. This driver uses the IIO consumer interface and relies on the vf610_adc driver based on the IIO framework. Signed-off-by: Sanchayan Maity --- drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/colibri-vf50-ts.c | 381 ++++++++++++++++++++++++++++ 3 files changed, 394 insertions(+) create mode 100644 drivers/input/touchscreen/colibri-vf50-ts.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 80f6386..28948ca 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -1027,4 +1027,16 @@ config TOUCHSCREEN_ZFORCE To compile this driver as a module, choose M here: the module will be called zforce_ts. +config TOUCHSCREEN_COLIBRI_VF50 + tristate "Toradex Colibri on board touchscreen driver" + depends on GPIOLIB && IIO && VF610_ADC + help + Say Y here if you have a Colibri VF50 and plan to use + the on-board provided 4-wire touchscreen driver. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called colibri_vf50_ts. + endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 44deea7..93746a0 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -84,3 +84,4 @@ obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o +obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o diff --git a/drivers/input/touchscreen/colibri-vf50-ts.c b/drivers/input/touchscreen/colibri-vf50-ts.c new file mode 100644 index 0000000..26187e0 --- /dev/null +++ b/drivers/input/touchscreen/colibri-vf50-ts.c @@ -0,0 +1,381 @@ +/* Copyright 2015 Toradex AG + * + * Toradex Colibri VF50 Touchscreen driver + * + * Originally authored by Stefan Agner for 3.0 kernel + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRIVER_NAME "colibri-vf50-ts" +#define DRV_VERSION "1.0" + +#define VF_ADC_MAX ((1 << 12) - 1) + +#define COLI_TOUCH_MIN_DELAY_US 1000 +#define COLI_TOUCH_MAX_DELAY_US 2000 +#define COLI_TOUCH_NO_OF_AVGS 5 +#define COLI_TOUCH_REQ_ADC_CHAN 4 + +struct vf50_touch_device { + struct platform_device *pdev; + struct input_dev *ts_input; + struct iio_channel *channels; + struct gpio_desc *gpio_xp; + struct gpio_desc *gpio_xm; + struct gpio_desc *gpio_yp; + struct gpio_desc *gpio_ym; + int pen_irq; + int min_pressure; + bool stop_touchscreen; +}; + +/* + * Enables given plates and measures touch parameters using ADC + */ +static int adc_ts_measure(struct iio_channel *channel, + struct gpio_desc *plate_p, struct gpio_desc *plate_m) +{ + int i, value = 0, val = 0; + int ret; + + gpiod_set_value(plate_p, 1); + gpiod_set_value(plate_m, 1); + + usleep_range(COLI_TOUCH_MIN_DELAY_US, COLI_TOUCH_MAX_DELAY_US); + + for (i = 0; i < COLI_TOUCH_NO_OF_AVGS; i++) { + ret = iio_read_channel_raw(channel, &val); + if (ret < 0) { + value = ret; + goto error_iio_read; + } + + value += val; + } + + value /= COLI_TOUCH_NO_OF_AVGS; + +error_iio_read: + gpiod_set_value(plate_p, 0); + gpiod_set_value(plate_m, 0); + + return value; +} + +/* + * Enable touch detection using falling edge detection on XM + */ +static void vf50_ts_enable_touch_detection(struct vf50_touch_device *vf50_ts) +{ + /* Enable plate YM (needs to be strong GND, high active) */ + gpiod_set_value(vf50_ts->gpio_ym, 1); + + /* + * Let the platform mux to idle state in order to enable + * Pull-Up on GPIO + */ + pinctrl_pm_select_idle_state(&vf50_ts->pdev->dev); +} + +/* + * ADC touch screen sampling bottom half irq handler + */ +static irqreturn_t vf50_ts_irq_bh(int irq, void *private) +{ + struct vf50_touch_device *vf50_ts = private; + struct device *dev = &vf50_ts->pdev->dev; + int val_x, val_y, val_z1, val_z2, val_p = 0; + bool discard_val_on_start = true; + + /* Disable the touch detection plates */ + gpiod_set_value(vf50_ts->gpio_ym, 0); + + /* Let the platform mux to default state in order to mux as ADC */ + pinctrl_pm_select_default_state(dev); + + while (!vf50_ts->stop_touchscreen) { + /* X-Direction */ + val_x = adc_ts_measure(&vf50_ts->channels[0], + vf50_ts->gpio_xp, vf50_ts->gpio_xm); + if (val_x < 0) + break; + + /* Y-Direction */ + val_y = adc_ts_measure(&vf50_ts->channels[1], + vf50_ts->gpio_yp, vf50_ts->gpio_ym); + if (val_y < 0) + break; + + /* + * Touch pressure + * Measure on XP/YM + */ + val_z1 = adc_ts_measure(&vf50_ts->channels[2], + vf50_ts->gpio_yp, vf50_ts->gpio_xm); + if (val_z1 < 0) + break; + val_z2 = adc_ts_measure(&vf50_ts->channels[3], + vf50_ts->gpio_yp, vf50_ts->gpio_xm); + if (val_z2 < 0) + break; + + /* Validate signal (avoid calculation using noise) */ + if (val_z1 > 64 && val_x > 64) { + /* + * Calculate resistance between the plates + * lower resistance means higher pressure + */ + int r_x = (1000 * val_x) / VF_ADC_MAX; + + val_p = (r_x * val_z2) / val_z1 - r_x; + + } else { + val_p = 2000; + } + + val_p = 2000 - val_p; + dev_dbg(dev, "Measured values: x: %d, y: %d, z1: %d, z2: %d, " + "p: %d\n", val_x, val_y, val_z1, val_z2, val_p); + + /* + * If touch pressure is too low, stop measuring and reenable + * touch detection + */ + if (val_p < vf50_ts->min_pressure || val_p > 2000) + break; + + /* + * The pressure may not be enough for the first x and the + * second y measurement, but, the pressure is ok when the + * driver is doing the third and fourth measurement. To + * take care of this, we drop the first measurement always. + */ + if (discard_val_on_start) { + discard_val_on_start = false; + } else { + /* + * Report touch position and sleep for + * next measurement + */ + input_report_abs(vf50_ts->ts_input, + ABS_X, VF_ADC_MAX - val_x); + input_report_abs(vf50_ts->ts_input, + ABS_Y, VF_ADC_MAX - val_y); + input_report_abs(vf50_ts->ts_input, + ABS_PRESSURE, val_p); + input_report_key(vf50_ts->ts_input, BTN_TOUCH, 1); + input_sync(vf50_ts->ts_input); + } + + msleep(10); + } + + /* Report no more touch, reenable touch detection */ + input_report_abs(vf50_ts->ts_input, ABS_PRESSURE, 0); + input_report_key(vf50_ts->ts_input, BTN_TOUCH, 0); + input_sync(vf50_ts->ts_input); + + vf50_ts_enable_touch_detection(vf50_ts); + + /* Wait for the pull-up to be stable on high */ + msleep(10); + + return IRQ_HANDLED; +} + +static int vf50_ts_open(struct input_dev *dev_input) +{ + struct vf50_touch_device *touchdev = input_get_drvdata(dev_input); + struct device *dev = &touchdev->pdev->dev; + + dev_dbg(dev, "Input device %s opened, starting touch detection\n", + dev_input->name); + + touchdev->stop_touchscreen = false; + + /* Mux detection before request IRQ, wait for pull-up to settle */ + vf50_ts_enable_touch_detection(touchdev); + msleep(10); + + return 0; +} + +static void vf50_ts_close(struct input_dev *dev_input) +{ + struct vf50_touch_device *touchdev = input_get_drvdata(dev_input); + struct device *dev = &touchdev->pdev->dev; + + touchdev->stop_touchscreen = true; + + /* Make sure IRQ is not running past close */ + mb(); + synchronize_irq(touchdev->pen_irq); + + gpiod_set_value(touchdev->gpio_ym, 0); + pinctrl_pm_select_default_state(dev); + + dev_dbg(dev, "Input device %s closed, disable touch detection\n", + dev_input->name); +} + +static int vf50_ts_get_gpiod(struct device *dev, + struct gpio_desc **gpio_d, const char *con_id, enum gpiod_flags flags) +{ + int error; + + *gpio_d = devm_gpiod_get(dev, con_id, flags); + if (IS_ERR(*gpio_d)) { + error = PTR_ERR(*gpio_d); + dev_err(dev, "Could not get gpio_%s %d\n", con_id, error); + return error; + } + + return 0; +} + +static void vf50_ts_channel_release(void *data) +{ + struct iio_channel *channels = data; + + iio_channel_release_all(channels); +} + +static int vf50_ts_probe(struct platform_device *pdev) +{ + struct input_dev *input; + struct iio_channel *channels; + struct device *dev = &pdev->dev; + struct vf50_touch_device *touchdev; + int num_adc_channels = 0; + int error; + + channels = iio_channel_get_all(dev); + if (IS_ERR(channels)) + return PTR_ERR(channels); + + error = devm_add_action(dev, vf50_ts_channel_release, channels); + if (error) { + iio_channel_release_all(channels); + dev_err(dev, "Failed to register iio channel release action"); + return error; + } + + touchdev = devm_kzalloc(dev, sizeof(*touchdev), GFP_KERNEL); + if (!touchdev) + return -ENOMEM; + + touchdev->pdev = pdev; + touchdev->channels = channels; + + while (channels[num_adc_channels].indio_dev) + num_adc_channels++; + + if (num_adc_channels != COLI_TOUCH_REQ_ADC_CHAN) { + dev_err(dev, "Inadequate ADC channels specified\n"); + return -EINVAL; + } + + error = of_property_read_u32(dev->of_node, "vf50-ts-min-pressure", + &touchdev->min_pressure); + if (error) + return error; + + input = devm_input_allocate_device(dev); + if (!input) { + dev_err(dev, "Failed to allocate TS input device\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, touchdev); + + input->name = DRIVER_NAME; + input->id.bustype = BUS_HOST; + input->dev.parent = dev; + input->open = vf50_ts_open; + input->close = vf50_ts_close; + + input_set_capability(input, EV_KEY, BTN_TOUCH); + input_set_abs_params(input, ABS_X, 0, VF_ADC_MAX, 0, 0); + input_set_abs_params(input, ABS_Y, 0, VF_ADC_MAX, 0, 0); + input_set_abs_params(input, ABS_PRESSURE, 0, VF_ADC_MAX, 0, 0); + + touchdev->ts_input = input; + input_set_drvdata(input, touchdev); + error = input_register_device(input); + if (error) { + dev_err(dev, "Failed to register input device\n"); + return error; + } + + error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xp, + "xp", GPIOD_OUT_LOW); + if (error) + return error; + + error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xm, + "xm", GPIOD_OUT_LOW); + if (error) + return error; + + error = vf50_ts_get_gpiod(dev, &touchdev->gpio_yp, + "yp", GPIOD_OUT_LOW); + if (error) + return error; + + error = vf50_ts_get_gpiod(dev, &touchdev->gpio_ym, + "ym", GPIOD_OUT_LOW); + if (error) + return error; + + touchdev->pen_irq = platform_get_irq(pdev, 0); + if (touchdev->pen_irq < 0) + return touchdev->pen_irq; + + error = devm_request_threaded_irq(dev, touchdev->pen_irq, NULL, + vf50_ts_irq_bh, IRQF_ONESHOT, + "vf50 touch", touchdev); + if (error < 0) + return error; + + return 0; +} + +static const struct of_device_id vf50_touch_of_match[] = { + { .compatible = "toradex,vf50-touchscreen", }, + { } +}; +MODULE_DEVICE_TABLE(of, vf50_touch_of_match); + +static struct platform_driver vf50_touch_driver = { + .driver = { + .name = "toradex,vf50_touchctrl", + .of_match_table = vf50_touch_of_match, + }, + .probe = vf50_ts_probe, +}; + +module_platform_driver(vf50_touch_driver); + +MODULE_AUTHOR("Sanchayan Maity"); +MODULE_DESCRIPTION("Colibri VF50 Touchscreen driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION);